
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <a class="navbar-brand" href="#">
          <img src="/static/main/img/nav.png" alt="商标">
      </a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">

        <form class="navbar-form navbar-left">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">🔍</button>
      </form>

    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>